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Synthesizing Pure Graphene, a ‘Miracle Material’

UConn chemistry professor Doug Adamson has found an inexpensive way to manufacture the pristine form of this substance, which is stronger than steel and thinner than a human hair. (Peter Morenus/UConn Photo)

Formed deep within the earth, stronger than steel, and thinner than a human hair. These comparisons aren’t describing a new super hero. They’re describing graphene, a substance that some experts have called “the most amazing and versatile” known to mankind.

UConn chemistry professor Doug Adamson, a member of the Polymer Program in UConn’s Institute of Materials Science, has patented a one-of-a-kind process for exfoliating this wonder material in its pure (unoxidized) form, as well as manufacturing innovative graphene nanocomposites that have potential uses in a variety of applications.

If you think of graphite like a deck of cards, each individual card would be a sheet of graphene. Comprised of a single layer of carbon atoms arranged in a hexagonal lattice, graphene is a two-dimensional crystal that is at least 100 times stronger than steel. Aerogels made from graphene are some of the lightest materials known to man, and the graphene sheets are one of the thinnest, at only one atom thick – that is approximately one million times thinner than a human hair. Graphene is also even more thermally and electrically conductive than copper, with minimal electrical charge.

Because of these unique qualities, graphene has been a hot topic for academic researchers and industry leaders since it was first isolated from graphite in 2004. Since then, more than 10,000 scholarly articles have been published about the material. But of these publications, only Adamson’s discusses a proprietary process for manufacturing graphene in its pristine form.

What others are calling “graphene” is often actually graphene oxide that has been chemically or thermally reduced. The oxygen in graphene oxide provides a sort of chemical handle that makes the graphene easier to work with, but adding it to pristine graphene reduces the material’s mechanical, thermal, and electrical properties in comparison to unmodified graphene like the kind Adamson produces.

It also significantly increases the cost to manufacture the material. Oxidizing graphite requires adding expensive hazardous chemicals, such as anhydrous sulfuric acid and potassium peroxide, followed by a lengthy series of manipulations to isolate and purify the products, known as a chemistry workup. Adamson’s process doesn’t require any additional steps or chemicals to produce graphene in its pristine form.

Soon after the initial experiments by graduate student Steve Woltornist indicated that something special was happening, Adamson was joined by longtime collaborator Andrey Dobrynin from the University of Akron, who has helped to understand the thermodynamics that drive the exfoliation. Their work has been published in the American Chemical Society’s peer-reviewed journal ACS Nano.“The innovation and technology behind our material is our ability to use a thermodynamically driven approach to un-stack graphite into its constituent graphene sheets, and then arrange those sheets into a continuous, electrically conductive, three-dimensional structure” says Adamson. “The simplicity of our approach is in stark contrast to current techniques used to exfoliate graphite that rely on aggressive oxidation or high-energy mixing or sonication – the application of sound energy to separate particles – for extended periods of time. As straightforward as our process is, no one else had reported it. We proved it works.”

A distinctive feature of graphene that seems like an obstacle to many – its insolubility – is at the heart of Adamson’s discovery. Since it doesn’t dissolve in liquids, Adamson and his team place graphite at the interface of water and oil, where the graphene sheets spontaneously spread to cover the interface and lower the energy of the system. The graphene sheets are trapped at the interface as individual, overlapping sheets, and can subsequently be locked in place using a cross-linked polymer or plastic.

Adamson began exploring ways to exfoliate graphene from graphite in 2010 with a grant from the Air Force to synthesize thermally conductive composites. This was followed in 2012 with funding from a National Science Foundation (NSF) Early-concept Grants for Exploratory Research (EAGER) award. Since then he has also been awarded a $1.2 million grant from the NSF Designing Materials to Revolutionize and Engineer our Future program and $50,000 from UConn’s SPARK Technology Commercialization Fund program.

“Dr. Adamson’s work speaks not only to the preeminence of UConn’s faculty, but also to the potential real-world applications of their research,” says Radenka Maric, vice president for research at UConn and UConn Health. “The University is committed to programs like SPARK that enable faculty to think about the broader impact of their work and create products or services that will benefit society and the state’s economy.”

Graphene for Water Desalination

While stabilized graphene composite materials have countless potential uses in fields as varied as aircrafts, electronics, and biotechnology, Adamson chose to apply his technology to improving standard methods for the desalination of brackish water. With his SPARK funding, he is developing a device that uses his graphene nanocomposite materials to remove salt from water through a process called capacitive deionization, or CDI.

CDI relies on inexpensive, high surface area, porous electrodes to remove salt from water. There are two cycles in the CDI process: an adsorption phase where the dissolved salt is removed from the water, and a desorption phase where the adsorbed salts are released from the electrodes by either halting or reversing the charge on the electrodes.

Many materials have been used to create the electrodes, but none have proven to be a viable material for large-scale commercialization. Adamson and his industry partners believe that his simple, inexpensive, and robust material could be the technology that finally brings CDI to market in a major way.

“The product we are developing will be an inexpensive graphene material, with optimized performance as an electrode, that will be able to displace more expensive, less efficient materials currently used in CDI,” says Michael Reeve, one of Adamson’s partners and a veteran of various successful startups.

The team formed a startup called 2D Material Technologies, and they have applied for a Small Business Innovation Research grant to continue to commercialize Adamson’s technology. Eventually, they hope to join UConn’s Technology Incubation Program to advance their concept to market.

Join us for a talk by Gina Barreca,2018 UCONN BOARD OF TRUSTEESDISTINGUISHED PROFESSOR OF ENGLISH

All great works of fiction, poetry and dramaâas well as texts forming mythologies, religions, national epics to heroic sagasâhave loneliness at the heart of their narrative. From Persephone to Peter Pan, from âFrankensteinâ to âFrozen,â the stories we pass along are saturated with unwilling isolation.âOnly around half of Americans say they have meaningful, daily face-to-face social interactions,â according to a 2017 study. A former U.S. Surgeon General argues that âWe live in the most technologically connected age in the history of civilization, yet rates of loneliness have doubled since the 1980s.â We need more than social media. We need social contact. We need community. How can we break through the loneliness barrier? Being alone when in need of companionship is more than sad; itâs an epidemic.Chronic loneliness is as bad for your health as smoking 15 cigarettes per day. We need to change our national story and, often, our personal ones as well.Even the concept of the âlone wolfâ is a myth. Wolves hunt in packs.

Reception to follow.

For more information about this event, or if you are an individual who requires special accommodation to participate, please contact the CLAS Deanâs Office at (860) 486-2713.

A liberal arts and sciences degree prepares students with the tools they need to excel across a wide range of careers. Given the number of options available to you, it can be overwhelming to narrow down career choices. Attending CLAS Career Night will provide you exposure to career opportunities for CLAS students.

This semesterâs focus will be on research-based careers. During this event you will engage with CLAS alumni, learn about various occupations, and gain insight about how to best prepare for your future career.

The McNair Scholars Program and the Office of Undergraduate Research invite you to join us for a brown bag research seminar.

Birds, Bacteria, and Bioinformatics: Why Evolutionary Biology is the Best

Sarah Hird, Ph.D., Assistant Professor, Molecular and Cell Biology

This series is open to all undergraduate and graduate students, and is designed especially for students conducting (or interested in conducting) STEM research. These seminars are opportunities to learn about research being pursued around campus, to talk with faculty about their path into research, and to ask questions about getting involved in research.

About CLAS

The College of Liberal Arts and Sciences is the academic core of learning and research at UConn. We are committed to the full spectrum of academics across the sciences, social sciences, and humanities. We give students a liberal arts and sciences education that empowers them with broad knowledge, transferable skills, and an ability to think critically about important issues across a variety of disciplines.